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@article{AM2_1980__21_182432, author = {M.J. Pelling and D.G. Rogers}, title = {Some (2, n) combinatorial {Stein} groupoids.}, journal = {Aequationes mathematicae}, pages = {225--235}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0465.20064}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182432/} }
M.J. Pelling; D.G. Rogers. Some (2, n) combinatorial Stein groupoids.. Aequationes mathematicae, Tome 21 (1980), pp. 225-235. http://geodesic.mathdoc.fr/item/AM2_1980__21_182432/